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  <title>检查类是否可实例化</title>

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</div><hr /><div id="reflectionclass.isinstantiable" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">ReflectionClass::isInstantiable</h1>
  <p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">ReflectionClass::isInstantiable</span> &mdash; <span class="dc-title">检查类是否可实例化</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-reflectionclass.isinstantiable-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">bool</span> <span class="methodname"><strong>ReflectionClass::isInstantiable</strong></span>
    ( <span class="methodparam">void</span>
   )</div>

  <p class="para rdfs-comment">
   检查这个类是否可实例化。
  </p>

 </div>


 <div class="refsect1 parameters" id="refsect1-reflectionclass.isinstantiable-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-reflectionclass.isinstantiable-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-reflectionclass.isinstantiable-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-5110">
    <p><strong>Example #1 <span class="methodname"><strong>ReflectionClass::isInstantiable()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">class&nbsp;</span><span style="color: #0000BB">C&nbsp;</span><span style="color: #007700">{&nbsp;}<br /><br />interface&nbsp;</span><span style="color: #0000BB">iface&nbsp;</span><span style="color: #007700">{<br />&nbsp;&nbsp;&nbsp;&nbsp;function&nbsp;</span><span style="color: #0000BB">f1</span><span style="color: #007700">();<br />}<br /><br />class&nbsp;</span><span style="color: #0000BB">ifaceImpl&nbsp;</span><span style="color: #007700">implements&nbsp;</span><span style="color: #0000BB">iface&nbsp;</span><span style="color: #007700">{<br />&nbsp;&nbsp;&nbsp;&nbsp;function&nbsp;</span><span style="color: #0000BB">f1</span><span style="color: #007700">()&nbsp;{}<br />}<br /><br />abstract&nbsp;class&nbsp;</span><span style="color: #0000BB">abstractClass&nbsp;</span><span style="color: #007700">{<br />&nbsp;&nbsp;&nbsp;&nbsp;function&nbsp;</span><span style="color: #0000BB">f1</span><span style="color: #007700">()&nbsp;{&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;abstract&nbsp;function&nbsp;</span><span style="color: #0000BB">f2</span><span style="color: #007700">();<br />}<br /><br />class&nbsp;</span><span style="color: #0000BB">D&nbsp;</span><span style="color: #007700">extends&nbsp;</span><span style="color: #0000BB">abstractClass&nbsp;</span><span style="color: #007700">{<br />&nbsp;&nbsp;&nbsp;&nbsp;function&nbsp;</span><span style="color: #0000BB">f2</span><span style="color: #007700">()&nbsp;{&nbsp;}<br />}<br /><br />class&nbsp;</span><span style="color: #0000BB">privateConstructor&nbsp;</span><span style="color: #007700">{<br />&nbsp;&nbsp;&nbsp;&nbsp;private&nbsp;function&nbsp;</span><span style="color: #0000BB">__construct</span><span style="color: #007700">()&nbsp;{&nbsp;}<br />}<br /><br /></span><span style="color: #0000BB">$classes&nbsp;</span><span style="color: #007700">=&nbsp;array(<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">"C"</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">"iface"</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">"ifaceImpl"</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">"abstractClass"</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">"D"</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">"privateConstructor"</span><span style="color: #007700">,<br />);<br /><br />foreach(</span><span style="color: #0000BB">$classes&nbsp;&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$class&nbsp;</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$reflectionClass&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">ReflectionClass</span><span style="color: #007700">(</span><span style="color: #0000BB">$class</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"Is&nbsp;</span><span style="color: #0000BB">$class</span><span style="color: #DD0000">&nbsp;instantiable?&nbsp;&nbsp;"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$reflectionClass</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">IsInstantiable</span><span style="color: #007700">());&nbsp;<br />}<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
Is C instantiable?  bool(true)
Is iface instantiable?  bool(false)
Is ifaceImpl instantiable?  bool(true)
Is abstractClass instantiable?  bool(false)
Is D instantiable?  bool(true)
Is privateConstructor instantiable?  bool(false)
</pre></div>
    </div>
   </div>
  </p>
 </div>



 <div class="refsect1 seealso" id="refsect1-reflectionclass.isinstantiable-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="methodname"><a href="reflectionclass.isinstance.html" class="methodname" rel="rdfs-seeAlso">ReflectionClass::isInstance()</a> - 检查类的实例</span></li>
   </ul>
  </p>
 </div>


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